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1-Hydroxy-2-[[3,3'-dimethoxy-4'-[(4-hydroxy-2-sulfobenzo[a]phenazin-3-yl)azo]-4-biphenylyl]azo]naphthalene-3,6,8-trisulfonic acid tetrasodium salt Structure

1-Hydroxy-2-[[3,3'-dimethoxy-4'-[(4-hydroxy-2-sulfobenzo[a]phenazin-3-yl)azo]-4-biphenylyl]azo]naphthalene-3,6,8-trisulfonic acid tetrasodium salt